Assessment of changes in bone levels around mini-implants supported mandibular overdentures

Abstract

Aims: The aim of the present study was to evaluate changes in bone levels around mini-implants supported mandibular overdentures .

Material and methods: According to Moustafa Elsayad et al study Thirteen patients with edentulous maxilla and mandible with healthy mucosa, sufficient mandibular space and sufficient bone height for placement of overdenture supported by mini-implants for mandible and removable denture for maxilla were selected. CBCT radiographs were obtained from patients before implantation. then mini-implants with 13 mm height and 3 mm diameter were selected. In 4 region of the mandible after transmucosal perforation or mucosal mini flap, a spiral drill drills one-third to one-second the length of the screw, then self-tapping mini-implants are inserted. surgical stent is placed to make the implants parallel. Immediately periapical radiographs with parallel technique are taken. Implants with a torque <35Ncm are inserted immediately and after 3 month of surgery patients are referred to a prosthesis specialist for prosthetic work . Then patients with 3 and 6 and 12 month recalls after surgery are visited and in all recall seances periapical radiography with parallel technique in implanted areas are taken. Then periapical radiographies that are taken in follow-up sessions and periapical radiographies that taken after implantation are compared and the extent of bone changes around mini-implants is examined.The results will be reported as descriptive statistical indicators. In order to investigate the effect of time on the rate of bone resorption, repeated measures analysis of variance will be used. SPSS software version 24 will be used to analyze the data. A probability value less than 0.05 will be considered a significant level.

Results: The mean of bone loss in 3 month after surgery was -0.52 ± 0.21 mm ,6 mounth after surgery was -0.64 ± 0.26 mm and 12 month after surgery was -0.70 ± 0.30 mm.

Conclusion: The rate of bone loss around the mini-implants during the one-year follow-up is in a good range according to the implant protocols.